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Allogeneic Peripheral Blood Progenitor Cell Transplantation in a Murine Model: Evidence for an Improved Graft-Versus-Leukemia Effect
Bertram Glass,
Lutz Uharek,
Matthias Zeis,
Peter Dreger,
Helmut Löffler,
Jörg Steinmann, and
Norbert Schmitz
From the 2nd Department of Internal Medicine and Institute for Immunology, Christian-Albrechts-University of Kiel, Kiel, Germany.
Peripheral blood progenitor cells (PBPCs) are increasingly being used to replace bone marrow cells (BMCs) as a source of hematopoietic stem cells also in the field of allogeneic transplantation. Whereas it is well known that PBPC grafts and BM differ significantly in progenitor cell content and lymphocyte dose, the clinical consequences of these differences with respect to engraftment, graft-versus-host disease (GVHD), and the graft-versus-leukemia (GVL) effect are more difficult to assess. We present a murine model that allows us to evaluate engraftment, GVHD, and GVL effect of allogeneic PBPC transplantation (PBPCT). Balb/c mice (H-2d) served as recipients. Donors were major histocompatibility complex-matched DBA/2 mice or syngeneic Balb/c mice, respectively. Experiments with increasing numbers of BMCs or Filgastrim-mobilized PBPCs showed that the number of progenitor cells in the graft was correlated with the probability to engraft, irrespective of the graft type. With identically high cell numbers transferred (1 × 109 nucleated cells/kg body weight [BW]), the mortality rates due to GVHD (25%) were about the same after allogeneic BM transplantation (BMT) and allogeneic PBPCT, although PBPC grafts contained four times more CD3+ T cells as compared with BM grafts (6.2 × 108 v 1.4 × 108/kg BW). For investigation of GVL activity, Balb/c recipients were injected with syngeneic cells of the B-lymphocytic leukemia cell line A20 2 days before transplantation. After total body irradiation to a dose of 7.5 Gy, 1 × 109/kg BW Balb/c PBPCs, DBA BMCs, or DBA PBPCs were infused. The relapse rates observed were 80% after syngeneic PBPCT (n = 22), 60% after allogeneic BMT (n = 23), and 34% after allogeneic PBPCT (n = 26) (allogeneic BMT v PBPCT, P = .032). We conclude that transplantation of allogeneic PBPCs instead of BM may enhance the GVL effect without an increase of GVHD.
Blood, Vol. 90 No. 4 (August 15), 1997:
pp. 1694-1700
© 1997 by The American Society of Hematology.
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